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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: You would still have a ground loop. posted by Pooge on July 4, 2007 at 17:27:16:
I should add that reversing the transformer leads to correct this might only be a bandaid approach for this particular power circuit arrangement. It may compromise the noise in a normal arrangement.
Tranformers have a different leakage capacitance from each side of a winding and ground. Therefore, one lead orientation will couple a different amount of noise to ground than the opposite lead arrangement. This is why reversing the plug may sound better one way than the other. To test for this, disconnect the PC ground from the chassis. Power up, and measure the voltage between the disconnected PC ground line and chassis. Shut off, reverse transformer leads, and measure voltage between the disconnected PC ground line and chassis again. The transformer connection having the lowest voltage between the chassis and the ground line is the one to use, because less leakage will flow to ground.
Hard to say if the best arrangement was done when amps were made, but perhaps putting the amps on differently phased circuits caused the leakage currents to add.
I'm not entirely confident of this is the entire reason for the noise. It could also be from one circuit being a loop coupled to the other via the ground line. There's no way of telling without going through the process of elimination.
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Follow Ups
- RE: You would still have a ground loop. - Pooge 17:42:55 07/04/07 (0)
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